Noah Solloway escapes New York City with his family to an estate on Long Island. Waitress Alison Lockhart and her husband struggle to move past a recent tragedy while Noah and Alison meet in a chance encounter.

The Butler estate prepares for the annual summer party; Noah is drawn to Alison, who feels indebted to her mother-in-law.

Noah asks Alison to help him research local culture; Cole takes a stand for his community; Helen takes care of business in Brooklyn.

Noah and Alison grow closer when they take a day trip together to Block Island to spend time away from their families.

As passions flare, Alison and Noah encounter new difficulties at home; Alison's estranged mother visits; Noah is conflicted about Whitney's behaviour.

After spending a night out with his friend, Noah learns that there is more to Alison than he knows; Helen wants to make the most of the time in Montauk; Alison and Cole try to keep the Lockharts safe.